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Multifaceted Regioregular Oligo(thieno[3,4-b]thiophene)s Enabled by Tunable Quinoidization and Reduced Energy Band Gap
产品简述
期刊
JACS
标题
Multifaceted Regioregular
Oligo(thieno[3,4-b]thiophene)s Enabled by Tunable Quinoidization and Reduced
Energy Band Gap
作者
Feng Liu, Guzmán L. Espejo, Shuhai Qiu, María Moreno
Oliva, João Pina, J. Sérgio Seixas de Melo, Juan Casado, and Xiaozhang
Zhu
摘要
Thiophene-based materials have occupied a crucial position in the
development of organic electronics. However, the energy band gaps of oligo- and
polythiophenes are difficult to modulate without resorting to push–pull
electronic effects. We describe herein a new series of monodisperse
oligo(thieno[3,4-b]thiophene) derivatives with well-defined regioregular
structures synthesized efficiently by direct C–H arylation. These compounds show
a unique palette of colors and amphoteric redox properties with widely tunable
energy band gaps. The capacity to stabilize both cations and anions results in
both anodic and cathodic electrochromism. Under excitation, these compounds can
produce photoionized states able to interconvert into neutral triplet or form
these through singlet exciton fission or intersystem crossing. These features
arise from a progressive increase in quinoidization on a fully planar platform
making the largest effective conjugation length among hetero-oligomers.
Oligo(thieno[3,4-b]thiophene)s might represent the more distinctive family of
oligothiophenes of this
decade.
原文链接
http://pubs.acs.org/doi/abs/10.1021/jacs.5b05940
2017年02月09日
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